tyvm for your prompt and courteous response.

very nice work :)

@brettcelicacoupe - Yep. At low speeds, it helps more than it hurts.

Telstar - The shift points come much closer to the motor's torque curve when one disables the throttle sensor input to the A/T computer. That keeps the shifts early and the motor speed relatively low. Most DC traction motors aren't too lossy up to 3000 rpm, and that's about where this A/T likes to shift when the throttle sensor isn't telling it to wait.

Chetsjug - The problem is, the percentage of Americans who drive stick shift cars is in the neighborhood of 10%, so doing anything with the clutch foot or that weird lever between the seats is a non-starter for them. That's the main reason I'm exploring the A/T as an option.

@liiighthead - Thanks!

@thegreatnoleander - I have not, although I intend to. I'm honestly not too concerned about the lifespan of this junkyard transmission, and I've found that the lag that one might expect when pulling out from a full stop is negligible.

@circusboy90210 - The pump is driven by the motor in the same way that it would be driven by the engine, but it is not driven when the car is stopped but still on -- when a gas engine would be idling. This should cause premature wear on the transmission, but for now I don't really care.

Orange are you still around? If so Hit me up please. Doing a PT Cruiser and Im willing to pay to pick your brain. Great job you do w/this stuff, amazing

Where you you go for and AWD torque motor for A 5SPD a/t tesla or forklift? Also do you use AC or DC current motor?

good day, I am wonder if you have a torque converter installed? I have googled and an actuator was suggested to keep the torque converter running like ICE, or else the wear and tare the cost automatic transmission life span. I would like to know how you deal with the problem? because I am planning on doing an EV conversion on my W123 automatic transmission also.

@jfbrink

6 жыл бұрын

I researched "idle circuits" on various EV forums at the time, and found some good ones. At this point, many years later, most controllers have a "idle" function that will allow you to keep the motor turning at whatever specific low RPM your automatic transmission needs to maintain pressure.

what drives the transmission pump?

Orange, what was the final outcome of your project? Is it workable to bolt up the EM to an automatic transmission?

@thegreatnoleander - Just a heads up that the A/T in your Sonic will probably be nearly impossible to operate properly without the engine. The level of integration between ECU and TCU (if there even is a separate TCU) is several orders of magnitude more extensive and complicated in recent vehicles than what I had to sort out with my 1994 Geo Metro unit or the 1994 Miata A/T that I worked out the wiring for. By the late '90s, it's too hard.

@ashleywilson6145

2 жыл бұрын

Trans and motor have separate I/O controls. It's why your CEL doesn't illuminate if you are having trans issues. Harness should be separate.

im sorry but i just dont understand how this works. you can blot your ev motor to the auto transmission and it will just work?

Hi; sorry I'm not very familiar with drivetrain mechanics; if I want to do this with an old automatic transmission (1991 Saab - which is really an even older 3 speed automatic transmission.... theoretically even better for electric conversion because of the existing gear ratios)... are you suggesting that if I remove the throttle position sensor or cable from the transmission - it will shift itself based on the rpm from the motor? Just as it does when it reaches 3400 rpms in first and second, for example? Or is there a need for an electronic signal to let the transmission know when to shift? Also, this car had the ability to manually shift - with a button to depress on the automatic shifter - such that I could downshift into 2nd and 1st at any time for hills. I feel like based on the gear ratios and shifter - there is some very easy way to couple an electric motor to this older automatic transmission? Help is greatly appreciated. What would be the first steps to determining or controlling how the car will shift - assuming I have a motor that will cruise at 5,000rpms. Also, because of the existing gear ratio and torque - couldn't it be a fairly fast car? For example - the stock version of the car is about 4,000rpms at let's say close to 85 mph in its highest gear - 3rd. If my motor is easily doing like 5000 rpm continuous (maybe like 105 mph cruising?) and feasibly much faster if higher rpms can be maintained? Sorry if this is stupid - I am assuming a serious battery - like a tesla battery with 300-400 volts or something. Thanks for any direction.

@jfbrink

5 жыл бұрын

Based on some quick googling, it appears that a 1991 Saab would have a Borg Warner T37 automatic, which is fully mechanical. That means you need no wiring for it to shift properly. But you would need to keep the throttle valve cable/linkage that relays the movement of the throttle pedal to transmission. This is a physical linkage or cable, not wiring. It is critical for proper shifting and transmission longevity. You would still be able to shift it manually. As to the rest of your question, it really can't be answered without knowing the specific motor, controller and battery involved.

@pawpawbandit3871

5 жыл бұрын

Thanks. Yes, oh yes....I know all about the cable! (because these transmissions are prone to failure, and the cable adjustment can be difficult if its not left in it's factory position). So the answer is YES, leave the pedal-shift linkage intact, throw in a motor (with adapter plate) and controller and some batteries, and I'll have an electric car right?

@pawpawbandit3871

5 жыл бұрын

Direct drive is the same as "final drive" gear ratio, right? I just realized there wouldn't really be any advantage in keeping the transmission in this car since final (direct) drive set-up would (given proper motor selection) have enough torque and similar top end.

Hi OCH. Did the car run successfully using the automatic transmission? I'm converting a car with a similar transmission. thanks

Who knew automatic transmissions shift themselves!

running a torque converter?

will an 80s model automatic transmission be easier than a later model

@jfbrink

7 жыл бұрын

The answer is "maybe", but "easier" is a short term goal. I was looking for the lightness, efficiency and precise control towards the long term goals of battery life and flexibility.

@stevencorrea7982

6 жыл бұрын

Orange Claw Hammer 10 months later hours and hours of studying Electronics. I finally understand.

I've always had manual transmissions, so I've never realized just how noisy an automatic is.

what is this video for? is this a manual gearbox converted? i dont get it

@jfbrink

9 жыл бұрын

John Meister Dupa - This is an electronically controlled transmission for which I made a custom harness so that it would run without the rest of the Geo Metro from which I removed it. So, the point of the video is to show that one could do this if one wanted a compact A/T for some custom purpose. Thanks for watching!

@MrUnderEstimated

9 жыл бұрын

so its a regular A/T converted to electronically controlled A/T? well cool :)